1) Everybody has done the task, don't they?
hasn't they
has he?
2) Let's prepare a surprise birthday party for Jane,...

will we?
shall we?
don't we?
3) Buy the magazine on your way home,

shall you?
won't you?
will you?
4) Let's go to the park,

will we?
shall we?
don't we?
5) Nothing will make you change your opinion,

won't it?
shall it?
will it?
6) Explain me the task,

isn't it?
will you?
aren't you?